llist.h

#ifndef foollistfoo#define foollistfoo/*** This file is part of avahi. avahi is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. avahi is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with avahi; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.***//** \file llist.h A simple macro based linked list implementation */#include <assert.h>#include <avahi-common/cdecl.h>AVAHI_C_DECL_BEGIN/** The head of the linked list. Use this in the structure that shall * contain the head of the linked list */00033#define AVAHI_LLIST_HEAD(t,name) t *name/** The pointers in the linked list's items. Use this in the item structure */00036#define AVAHI_LLIST_FIELDS(t,name) t *name##_next, *name##_prev/** Initialize the list's head */00039#define AVAHI_LLIST_HEAD_INIT(t,head) do { (head) = NULL; } while(0)/** Initialize a list item */00042#define AVAHI_LLIST_INIT(t,name,item) do { \ t *_item = (item); \ assert(_item); \ _item->name##_prev = _item->name##_next = NULL; \ } while(0)/** Prepend an item to the list */00049#define AVAHI_LLIST_PREPEND(t,name,head,item) do { \ t **_head = &(head), *_item = (item); \ assert(_item); \ if ((_item->name##_next = *_head)) \ _item->name##_next->name##_prev = _item; \ _item->name##_prev = NULL; \ *_head = _item; \ } while (0)/** Remove an item from the list */00059#define AVAHI_LLIST_REMOVE(t,name,head,item) do { \ t **_head = &(head), *_item = (item); \ assert(_item); \ if (_item->name##_next) \ _item->name##_next->name##_prev = _item->name##_prev; \ if (_item->name##_prev) \ _item->name##_prev->name##_next = _item->name##_next; \ else {\ assert(*_head == _item); \ *_head = _item->name##_next; \ } \ _item->name##_next = _item->name##_prev = NULL; \ } while(0)AVAHI_C_DECL_END#endif